Abstract:
:We examined nevi and melanomas in 10 xeroderma pigmentosum (XP) patients with defective DNA repair. The lesions had a lentiginous appearance with markedly increased numbers of melanocytes. Using laser capture microdissection, we performed DNA sequencing of 18 benign and atypical nevi and 75 melanomas (melanoma in situ and invasive melanomas). The nevi had a similar high frequency of PTEN mutations as melanomas [61% (11/18) versus 53% (39/73)]. Both had a very high proportion of UV-type mutations (occurring at adjacent pyrimidines) [91% (10/11) versus 92% (36/39)]. In contrast to melanomas in the general population, the frequency of BRAF mutations (11%, 7/61), NRAS mutations (21%, 13/62), and KIT mutations (21%, 6/28) in XP melanomas was lower than for PTEN. Phospho-S6 immunostaining indicated activation of the mTOR pathway in the atypical nevi and melanomas. Thus, the clinical and histological appearances and the molecular pathology of these UV-related XP nevi and melanomas were different from nevi and melanomas in the general population.
journal_name
Pigment Cell Melanoma Resjournal_title
Pigment cell & melanoma researchauthors
Masaki T,Wang Y,DiGiovanna JJ,Khan SG,Raffeld M,Beltaifa S,Hornyak TJ,Darling TN,Lee CC,Kraemer KHdoi
10.1111/pcmr.12226subject
Has Abstractpub_date
2014-05-01 00:00:00pages
454-64issue
3eissn
1755-1471issn
1755-148Xjournal_volume
27pub_type
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